You have a server named Data1 that runs a Server Core Installation of Windows Server
2012 R2 Standard.
You need to configure Data1 to run a Server Core Installation of Windows Server 2012 R2
Datacenter. You want to achieve this goal by using the minimum amount of administrative
effort.
What should you perform?

A.
An offline servicing by using Dism

B.
A clean installation of Windows Server 2012 R2

C.
An upgrade installation of Windows Server 2012 R2

D.
An online servicing by using Dism

Explanation:
There are a couple of ways to install the GUI from the command prompt, although both use
the same tool – DISM (Deployment Image Service Manager). When you are doing it for a
single (local) server, the command is:
Dism /online /enable-feature /featurename:ServerCore-FullServer /featurename:…
References:
Training Guide: Installing and Configuring Windows Server 2012 R2: Chapter 2: Deploying
Servers, p. 44
Exam Ref 70-410: Installing and Configuring Windows Server 2012 R2: Chapter 1: Installing
and Configuring Servers, p. 19-22